Commitments and contingencies - Balance sheet disclosures (Details) $ in Thousands	Jun. 30, 2024 USD ($)
Operating leases
2022 (remaining three months)	$ 872
2026	1,171
2027	1,137
2028	1,086
2029	1,005
Thereafter	925
Total lease payments	6,196
Less: interest	1,432
Total lease liabilities	4,764
Financing lease
2022 (remaining three months)	2,050
2026	2,799
2027	2,883
2028	2,969
2029	3,058
Thereafter	31,995
Total lease payments	45,754
Less: interest	19,760
Total lease liabilities	25,994
Total
2022 (remaining three months)	2,922
2026	3,970
2027	4,020
2028	4,055
2029	4,063
Thereafter	32,920
Total lease payments	51,950
Less: interest	21,192
Total lease liabilities	$ 30,758